On April 1, the NTSB celebrated its 40th anniversary. On that date in 1967, the Bureau of Safety was removed from the Civil Aeronautics Board and became the new accident investigation agency. Each year, the agency’s staff of fewer than 400 employees investigates more than 2,000 accidents and incidents. According to chairman Mark Rosenker, the Safety Board’s independent investigations have contributed to making the U.S transportation system the envy of the world.